Chowunikira Ubwino wa Dothi

Kodi mungatiuze zambiri za momwe mchere umakhudzira zotsatira zake? Kodi pali mtundu wina wa mphamvu ya ma ayoni awiri m'nthaka?

Zingakhale bwino mukandidziwitsa zambiri zokhudza izi. Ndikufuna kuyesa bwino chinyezi cha nthaka.

Tangoganizirani ngati pakanakhala kondakitala wangwiro kuzungulira sensa (mwachitsanzo, ngati sensayo ikaviikidwa mu chitsulo chamadzimadzi cha gallium), ikalumikiza ma capacitor plates kuti chotetezera chokhacho pakati pawo chikhale chophimba chopyapyala pa bolodi la circuit.

Masensa otsika mtengo awa, omangidwa pa ma chips 555, nthawi zambiri amagwira ntchito pafupipafupi mu ma kHz makumi, omwe ndi otsika kwambiri kuti athetse mphamvu ya mchere wosungunuka. Angakhale otsika mokwanira kuti abweretse mavuto ena monga kuyamwa kwa dielectric, komwe kumadziwonetsera ngati hysteresis.

Dziwani kuti bolodi la sensa ndi capacitor yotsatizana yokhala ndi dera lofanana ndi nthaka, imodzi mbali iliyonse. Muthanso kugwiritsa ntchito electrode yosatetezedwa popanda chophimba chilichonse kuti mulumikizane mwachindunji, koma electrodeyo idzasungunuka mwachangu m'nthaka.Kugwiritsa ntchito mphamvu yamagetsi kumayambitsa kugawanika kwa mphamvu yamagetsi m'nthaka + m'madzi. Kulola kwamphamvu kwamagetsi kumayesedwa ngati ntchito ya mphamvu yamagetsi yogwiritsidwa ntchito, kotero kugawanika kwa mphamvu yamagetsi nthawi zonse kumakhala kumbuyo kwa mphamvu yamagetsi yogwiritsidwa ntchito. Pamene kuchuluka kwa mphamvu yamagetsi yogwiritsidwa ntchito kukukwera kufika pamlingo wapamwamba wa MHz, gawo longopeka la mphamvu yamagetsi yosakanikirana imatsika kwambiri pamene kugawanika kwa mphamvu yamagetsi yamagetsi sikukutsatiranso kugwedezeka kwamphamvu kwa mphamvu yamagetsi.

Pansi pa ~500 MHz, gawo longopeka la dielectric constant limakhala ndi mchere wambiri ndipo, motero, conductivity. Pamwamba pa ma frequency awa, dipole polarization idzachepa kwambiri ndipo dielectric constant yonse idzadalira kuchuluka kwa madzi.

Masensa ambiri amalonda amathetsa vutoli pogwiritsa ntchito ma frequency otsika komanso kugwiritsa ntchito calibration curve kuti awerengere momwe nthaka ilili komanso ma frequency ake.